Apostrophes and Commas

it is

its

it's

it has

Saras cat is very playful.

'Sara's cat is very playful.'

Saras' cat is very playful.

Sara cat is very playful.

pluralization

abbreviation

possession

contraction

When separating a subject from its verb in a sentence.

When joining two independent clauses with a coordinating conjunction.

When using a subordinating conjunction between two independent clauses.

When joining two dependent clauses with a coordinating conjunction.

I went to the store, and I forgot to buy milk.

I went to the store, but I forgot to buy milk.

I went to the store, so I forgot to buy milk.

I went to the store but I forgot to buy milk.

they're

they'd

they'll

they've

childs

child's

childrens

children's

Possession

Contraction

Comparison

Plurality

I wanted to go to the beach but it started raining.

I wanted to go to the beach, but it started raining.

I wanted to go to the beach, it started raining.

I wanted to go to the beach, and it started raining.

The girl's locker is a mess.

The girls' locker is a mess.

The girls locker is a mess.